Ventilator



April 10, 1945.

PIIII'IIIIII H. T. PAISTE, JR

VENTILATOR Filed Sept 8, 1941 s Sheets-Sheet 2 p 1945. H. TQPAIS'TE, 4R2,373,496

VENTILATOR Filed Sept.,8, 1941 s SheeiS-Sheet s .Zhvarzfor WKM trol.

Patented Apr. 10, 1945 VENTILATOR Henry T. Paiste, J r., Villanova, Pa.,assignor to Philco Radio and Television Corporation, Philadelphia, Pa.,a corporation of Delaware Application September 8, 1941,,Serial No.410.067

6 Claims.

This invention relates to ventilating units, and has especial referenceto self-contained, portable units adapted for ready installation on awindow sill. More particularly, the invention relates to ventilators ofthe above type which employ power driven fan means and provide forselective control of air circulation by the manipulation of dampers.

It is the primary object of the present invention to improve andsimplify, the construction and assembly of such ventilators, and toprovide a unit having novel air circulation control means, which is easyto operate and is constructed in such a way as to improve the fanefficiency.

Another object of the invention is to provide a ventilator in which thefan scroll is formed in part by the cabinet structure and in part byadjustable air-control dampers which are highly eificient andsusceptible of easy and positive con- A further object of the inventionresidesin the provision of a unified control means for the dampers, ofsuch a naturethat the direction and quantity of the moving air may beeither simultaneously or independently varied.

A still further object of the invention is to provide a ventilator whichmay be easily assembled from relatively inexpensive materials, and whichis of, such a constructional arrangement that the motor and itsassociated fan units may be readily inserted into or withdrawn from thecasing to effect installation, adjustments or repairs.

Other objects and advantages of the invention will be best understood bconsidering the following detailed description in the light of theaccompanying drawings, in which doors or dampers and the control linkagetherefor; andillustrates one of the scroll partitions:

Fig. is a detail sectional view taken along line 55 of Fig. 3; and

Figs. 6 to 9 are diagrammatic views showing the air fiow resulting fromdifferent adjustments of the, control dampers. I I

.With' particular reference to Figs. 1, 2 and 3 of the, drawings, itwill be seen that the ventilator comprises a cabinet having a curvedscroll-forming roof portion' I preferably formedof wood veneer. Suitablyconfigured side panels 2, as

shown. extend along the side of the ventilator from the front to therear thereof. A unitary grill member 3 covers the front of the cabinet,and may be detachably fastened to the side panels 2 and base member 4,as by means of recessed screws 5.

Although the ventilator is portable, as pointed out above, and may beused Wherever it is convenient to do so, it is particularly well suitedto permanent installation, as on a window sill. For this purpose, thereis provided a sash basing strip 6 which extends horizontally across thetop of the cabinet immediately behind the curved scroll portion I. Theupper surface of thisstrip is adapted to cooperate with and support thelower edge of the window sash (not shown). A rear closure door I isslidingly fitted-in vertical tracks "8, inwardly of a suitable rain hood9. As it appears in Figs. 1 and 2, this slidig door is equipped with asuitable hinge la, which may be of the piano-hinge type. This hingepermits the door 1 to fold backward against the roof portion I, when thedoor is in the open position. It will be obvious that the ventilatormust be fixed-with.

relation to the window frame or sill, and that side adaptor panels willbe necessary if the window is wider than the ventilator. However, asthis mounting is not a part of the present invention. and may be done inany convenient way, it is not necessary to illustrate it. The interiorconstruction of the unit will no be described with particular referenceto Figs. 2. 3 and 4 of the drawings. A motor l0, located centrall of thedevice, is supported by brackets ll fixed to a pedestal block I 2,through which passes a damper control rod 13. The motor is provided withshort shaft extensions 14-14 to which are fixed a pair of fans l5l5. Forefilciency and quiet operation a squirrel-cagefan isemployed, that is,one in which air is supplied to the fan along the shaft axis, and isdischarged outwardly through the blading, as indicated by the arrows inFig. 3.

An air cleaning filter l6, of spun glass or the like, is provided. Theinterior of the ventilator is divided into three compartments, one forthe motor and the others for the fans, by a pair of partitions I1--l'lof scroll shape. These partitions conform with the contour of roofmember I and, as most clearly appears in Fig. 4. are provided with agenerally central aperture I8 of a diameter equal to that of the fans I5. As may be seen by a comparison of Figs. 2 and 4, these partitionsdefine the general scroll shape which has the type employed. Eachpartition is provided with a forward vertical edge which resides closelyadjacent the front grill member s. To facilitate assembly of the device,each partition member is further provided with a removable insert IEadapted to be fixed thereto, as by means of screws as. Reference to Fig.2 will show that with this type of construction the cabinet may becompletely fabricated at one zone of an assembly line, after which themotor and its associated fans may be readily inserted as a unit atanother zone of the line. At this later stage of as semlbly, with themotor already fastened to its mounting block, it is a relatively simplematter to insert the shafts i l into the partition slots, move the motorup into place in the cabinet, and allow the mounting block to swingdownwardly into position in contact with the floor plate 4. Fasteningthe block to said plate and screwing the inserts l9 into place completesthe motor and fan installation.

Referring now to the air control means, it will be seen that the deviceis provided with pairs of front and rear damper doors 2l-2l and 22-22respectively. The vertically disposed front doors are mounted forhorizontal sliding movement beitween grill member 3 and a. pair ofscroll filler pieces 23-23 as by means of a track 2311; while the reardampers, shaped to the configuration of the scroll partitions, aremounted for horizontal sliding movement by means of tracks 24 and 25(see Fig. 2), and extend from the floor to the curved roof member, toclose and complete the scroll shape. As will be clear from thedescription of operation, in at least two of their positions ofadjustment, these curved rear doors cooperate with the roof member I toform a part of the fan scroll.

Each of the four doors is equipped with a movable arm 28. The arms arepivotally connected to the doors as at 21, and have their other endspinned to a door actuatinglever 28 which, in the case of the curved reardoors, is fixed to the actuating shaft l3 (see Fig. 4). The actuatinglever of the forward pair of doors is fixed to a short hollow shaft 29of larger diameter than shaft l3 and mounted concentrically therewith..As will be apparent from Fig. 5, shafts l3 and 29 are provided withexternal control knobs 30 and 3|, respectively, the knobs beingpositioned to permit either simultaneous or independent variation of thesetting of the two shafts.

The various types of operation of which the device is capable' will nowbe discussed, and will be best understood by considering Figs. 4 and 6to 9.

Figs. 6 to 9 illustrate diagrammatically the four fundamental conditionsof operation, and in discussing these flgures, the upper edge of eachdiagram will be considered the outdoors side of the units, while thelower edge represents the indoors side.

knob on the front panel is turned to the on position, and both of thecontrol knobs 30 and 3| are turned counter-clockwise until the pairs ofdamper doors reach the positions shown in 6. In this position ofadjustment (and with the vertical sliding door 1 open) air will fiowthrough the filter into the central chamber, thence along the bloweraxis into each of the fan chambers. and will be expelled into the roomthrough the side louvers in panel 3. It will be understood that the airis actually thrown outwardly through the blading (the motor always turnsin the same direction) and is'forced into the room by the cooperatingscroll throughan opening in either the back or the front thereof,depending upon the g iiustment of the dampers.

To exhaust the highest possible amount of air from the room, the knobs3t and it are turned in the clockwise direction until the controlclampers have reached the position shown in Fig. Z. As will be readilyapparent from the figure, the room air enters the unit through thecentral part of the grillwork, flows along the axes of the blowersthrough the apertures is provided in the partitions l1, and is againexpelled from the fan chambers.

Fig. 8 illustrates the damper adjustment necessary to effectsimultaneous two-way flow of the air. In view of the precedingexplanations, further elucidation of this figure is not necessary,except to point out that the air coming from both sides of the unit isentering the central chamber, the fan chambers still being used purelyfor expulsion.

To effect recirculation of the room air, the doors are moved to thepositions shown in Fig. 9. When this adjustment has been made, and thesliding door I closed, the unit will cause a substantial circulation ofair within the room.

From the foregoing description, it will be seen that the inventionprovides a novel ventilating device capable of a number of differenttypes of operations in which the fan scroll is formed in part by themain structural elements of the cabinet itself, and in part byadjustable air-control dampers which are highly efficient andsusceptible of easy and positive control. In addition, the dampercontrol means is conveniently arranged, readily adjustable and positivein its action.

It will also be apparent that the invention provides a ventilating unitwhich, although portable and highly compact, may be easily assembledfrom relatively inexpensive materials, and the power unit of which isaccessibleand may be readily removed, should repairs be necessary.

The ventilator illustrated may be modified in certain respects withoutdeparting from the spirit of the invention. For example, the number andarrangement of the various chambers might be altered, the fans might bedriven from some external source, rather than the motor shown, etc.Moreover, it will be clear that the invention is not to 'be understoodas being limited to the use of scroll-shaped dampers in the rear of theventilator only, but that this principle may be applied to the frontdamper doors as well, if such should be desired. However, it will beunderstood that the invention contemplates such changes andmodifications as may fall within the scope of the appended claims.

I claim: I

1. In a ventilator, a casing having air ingress and egress openingstherein, air-propelling means within said casing, a plurality ofadjustable dampers for controlling the flow of air through saidopenings, and actuating means for the respective dampers including apair of concentric dampers forming a portion of the scroll wall controlelements each operable by a separate manual control member, said membersbeing constructed and arranged to enable simultaneous or individualadjustment of said dampers.

3. In a ventilator capable of moving air both into and out of a space tobe ventilated, the combination of a substantially scroll-shaped casingdivided to provide separate inlet and exhaust chambers, a passagebetween said chambers, said chambers being of generally scroll shape andsaid exhaust chamber having air propelling means therein, each of saidinlet and exhaust chambers having an opening communicating with theatmosphere and an opening communicating with the space to be ventilated,and a pair of dampers,

each damper being adapted to cooperate selectively with one of theopenings in the inlet chamber and with one of the openings in theexhaust chamber, one of said dampers being mounted for translationalmovement to effect selective cooperation with said two chambers andconstituting a portion of said scroll-shaped casing when in cooperationwith either of said chambers.

a 4. In a ventilator, the combination of a casing divided to provideseparate inlet and exhaust chambers, a passage between said chambers,said exhaust chamber being of generally scroll-shape and having airpropelling means therein, both said inlet and exhaust chambers havingopenings respectively communicating with the atmosphere and with a spaceto be ventilated, a pair of dampers, each damper being constructed andarranged to cooperate with one of the openings in the inlet chamber andwith one of the openings in the exhaust chamber, and means providingselective control or the positions or said dampers, whereby air may bemoved under the influence of the propelling means both into and out ofthe space to be ventilated, said damper control means comprises twoconcentric control elements, each operable by means or a separate manualcontrol member, said members being constructed and arranged to providefor either simultaneous or independent variation of the positions orsaid dampers, at least one of said when in one of itspositions ofadjustment.

5. In a ventilating unit capable of moving air both into and out of aspace to be ventilated, a blower chamber, a blower in said chamber, an

air intake chamber communicating with said blower chamber for deliveryof air to the blower, each of said intake and blower chambers having apair. of openings communicating respectively with the atmosphere andwith the space to be ventilated, a pair of dampers operativelyassociated respectively with the two sets of corresponding openings ofsaid pairs, each damper being mounted for edgewise translational move-'ment between two terminal positions in one of which it closes one of theopenings of the associated set sand in the other of which it closes theother opening of. said set, and said dampers being operative inpositions intermediate said terminal positions to simultaneouslypartially close both of the openings of the associated set and invarying relative degrees depending on said position, said dampersthereby providing for regulated movements of air under influence of theblower either into or out of the space to be ventilated or both into andout of the said space simultaneously.

6. In a ventilator, the combination of a casing divided to provideseparate inlet and exhaust chambers, a port between said chambers, saidexhaust chamber being of generally scroll shape and havingair-propelling means therein, each of said inlet and exhaust chambershaving a pair of openings respectively communicating with the atmosphereand with the space to be ventilated, a pair of dampers operativelyassociated respectively with the two sets of corresponding openings ofsaid pairs, each damper being mounted for edgewise translationalmovement between two terminal positions in one of which it closes one ofthe openings or the asosciated set and in the other or which it closesthe other opening of said set, and said dampers being operative inpositions intermediate said terminal positions to simultaneouslypartially close both of the open: ings of the associated set and invarying relative degrees depending on said position, said dampersthereby providing for movements of air under influence o! the propellingmeans either into or out of the space to be ventilated or both into andout of the said sets simultaneously, at least one of said dampersforming a portion of the scroll wall when i'n certain of its positionsof adiustment.

HENRY '1. PAISTE, Js.

